| CI | Confidence interval |
| CO | Carbon monoxide |
| COPD | Chronic obstructive pulmonary disease |
| HAP | Household air pollution |
| IDEA | Integrated Development Association |
| PM | Particulate matter |
| PM2.5 | Particulate matter less than 2.5 mm in diameter |
| PR | Prevalence ratio |
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.